Answer the following statements true (T) or false (F)
1. Molecular homologies indicate that living species evolved from a common ancestor or interrelated group of common ancestors.
2. Microevolution would be reflected in disequilibrium in Hardy-Weinberg.
3. In red-wing blackbirds, females tend to choose males with the most desirable territories. Males compete for territories. This is an example of intersexual selection combined with intrasexual selection.
4. Sickle-cell anemia is a disease that occurred from a point mutation in the replication of DNA. That mutation causes a change of an amino acid in ?-globulin. Nonrandom mating (not mating with any individual that has the allele for the mutation) could result in the removal of the mutated allele from a population. This would be an example of natural selection.
5. Neutral variation is supported by the observation that most changes in codons occur in the third position within the codon, which often has no effect on the sequence of amino acids in the protein.
1. TRUE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Indicate whether the statement is true or false.
Preferred samples for plating onto Ashdown media include throat, rectal, or sputum samples. Disease presentation can range from subclinical to disseminated disease. This infection is en-demic in Southeast Asia. Which organism is being sought?
a. B. cepacia b. Burkholderia gladioli c. B. mallei d. B. pseudomallei
When cAMP is produced in a cell, it will then ______.
A. dephosphorylate proteins phosphorylated by protein kinase A B. bind to a repressor of protein kinase A C. inhibit protein kinase A D. increase transcription of protein kinase A E. serve as a substrate of protein kinase A
The water pressure gradient in phloem tubes is formed by the
A) leaves being higher than the roots, which means that gravity creates pressure. B) diffusion of water from one sieve-tube cell to the next. C) loading of sugars into phloem at sources and removal of sugars at sinks. D) active transport of water from sugar sources to sugar sinks.